javascript - filter file upload for only text files - Stack Overflow

admin管理员组

文章数量:1333442

I am using Firefox version 14.0.1. I need to filter the upload file window to show up only .txt files.

My browser is not supporting only for text files(text/plain). I can restrict image files by specifying this format ("image/*"). But I need to filter only text files in File Selector window.

I just want to upload text files(.txt) only and should restrict to other file formats uploading.

Is there any problem with my browser?

I am using Firefox version 14.0.1. I need to filter the upload file window to show up only .txt files.

My browser is not supporting only for text files(text/plain). I can restrict image files by specifying this format ("image/*"). But I need to filter only text files in File Selector window.

I just want to upload text files(.txt) only and should restrict to other file formats uploading.

Is there any problem with my browser?

• javascript
• html
• asp-mvc
• file-upload

Share Follow edited Feb 3 at 5:15 C.HA 29833 silver badges2121 bronze badges asked Aug 20, 2012 at 6:45 DevaDeva 13933 silver badges1010 bronze badges

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 4

Simply do this...

$("#form").submit(function(e) {
  e.preventDefault();
  var checkUploadFileExtension =  $('input[type=file]').val().replace(/C:\\fakepath\\/i, '').split('.').pop();

  if(checkUploadFileExtension === 'txt') {
    alert("Success Uploaded!");
    //Do Something
  } else {
    alert("Please upload text file only");
    //Show error
  }
});

<script src="https://ajax.googleapis./ajax/libs/jquery/2.1.1/jquery.min.js"></script>


<form id="form" name="form" method="post">
  <input name="file" id="file" type="file" accept="text/*" />
  <button class="btn operations-btn btn-default" id="submit">Upload</button>
</form>

I hope, will help my post. Thank you

So according to the MDN reference on the input element accept=[MIME Type] is unimplemented in Gecko and currently you can only do : accept=image|audio|video

One way you could do this is a server side check for the type on the asp-mvc controller.

But a nicer way would be to do it on the client with some javascript: Something like this:

<script>
function checkExt() {
 if(document.mainForm.myfile.value.lastIndexOf(".txt")==-1) {
    alert("Please upload only .txt extention file");
    return false;
 }
}
</script>
<form name="mainForm">
<input type="file" name="myfile" onchange="checkExt();"/>
</form>​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

See it running here: http://jsfiddle/Egr9V/

If your using JQuery you could make your code slicker or use the Validation plugin as described in this post: How to have jQuery restrict file types on upload?

本文标签： javascriptfilter file upload for only text filesStack Overflow